Expression (Commons EL 1.0.1-SNAPSHOT API)

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java.lang.Object
- org.apache.commons.el.Expression

Direct Known Subclasses:

BinaryOperatorExpression, ComplexValue, ConditionalExpression, ExpressionString, FunctionInvocation, Literal, NamedValue, UnaryOperatorExpression
```
public abstract class Expression
extends Object
```
The abstract class from which all expression types derive.

Version:

$Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: bayard $

Author:

Nathan Abramson - Art Technology Group, Shawn Bayern

Constructor Summary

Constructors
Constructor and Description

Expression()

Method Summary

Methods
Modifier and Type	Method and Description
`abstract Expression`	`bindFunctions(FunctionMapper functions)` Returns an expression with all `FunctionInvocation`s replaced by `BoundFunctionInvocation`s.
`abstract Object`	`evaluate(VariableResolver pResolver, FunctionMapper functions)` Evaluates the expression in the given context
`abstract String`	`getExpressionString()` Returns the expression in the expression language syntax

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Expression
```
public Expression()
```
- Method Detail
  - getExpressionString
```
public abstract String getExpressionString()
```
    Returns the expression in the expression language syntax
  - evaluate
```
public abstract Object evaluate(VariableResolver pResolver,
              FunctionMapper functions)
                         throws ELException
```
    Evaluates the expression in the given context
    
    Throws:
    
    ELException
  - bindFunctions
```
public abstract Expression bindFunctions(FunctionMapper functions)
                                  throws ELException
```
    Returns an expression with all FunctionInvocations replaced by BoundFunctionInvocations.
    
    Parameters:
    functions - the functions to use in this transformation
    
    Returns:
    an Expression identical to this expression except with all FunctionInvocations replaced by BoundFunctionInvocations.
    
    Throws:
    
    ELException - if any of the functions in this Expression are not present in functions

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